hw4-0

fluid rows, when making narrow row data folds
added row fluids
hw4-1-1, added navbar, BUG: it does not open up
hw4-1-2
hw4-1-3 placeholder
hw4-1-4 right-center-left with lines of different colors
hw4-1-5 thermometer using progress bar
hw4-1-6 social buttons
hw4-1-7 asset
hw4-1-8 fixes collapse accordion by using bootstrap.js
hw4-1-8 more
hw4-1-9 footer
Merge branch 'staging'
[ADDED] content for smartphone+phone controlled (cooktop+pot mixer)
Added alt attributes for img tag.